Why do humans NEED to sleep?

Subject: Why do humans NEED to sleep?

Date: Wed Oct 3 19:41:42 2001
Posted by Andrew
Grade level: 10-12 School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: General Biology
ID: 1002152502.Gb

Message:


2 questions. Can people go without sleep (24 hour a day conciousness) for many 
days. In other words is it physicly possible for a human to retain constant 
conciounsness for weeks, mounths or years?

2nd, If we can't do this, why do humans truly need to sleep? Why isn't resting, 
or just lying down for 8 hours enough? Sleep doesn't seen to make evelutionary 
sence either. Isn't wasting 6-9 hours a day doing nothing a bit wasteful?

thanks for the time

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